Question: Let X be a geometric random variable with parameter p. Derive the formula for E(X) by using the power series formula 1 + 2x +

Let X be a geometric random variable with parameter p. Derive the formula for E(X) by using the power series formula1 + 2x + 3x + 1 (1-x) for x < 1.

1 + 2x + 3x + 1 (1-x) for x < 1.

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